Drop-head sewing-machine.



N0. 351,422. PATENTBD APR. 23. 1907.

' F. P. HUYGK.

DROP HEAD SEWING MACHINE.-

APPLIOATION FILED MARJB, 1908.

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PATENTBD APR. 23, 1907.

F. P. HUYCK. DROP HEAD SEWING MACHINE.

APPLICATION FILED MARJQ, 1906.

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10.851.422. PATENTBD APR.23,1907. F.P.HUYGK.

DROP HEAD SEWING MACHINE.

APPLIOATION FILED Mums, 1906.

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DROP-H EAD SEWING-MACHINE'.

Specification of Letters Patent.

Patented April 23, 1 907.

Application filed March 19,1906. Serial N0. 306.752.

To MZ whom t may concern:

Be it known that I, FRANCISA P. HUYCK, a citizen of the United States of America, residing at Swanton, in the county of Fulton `and State of Ohio, have invented certain new To this end the invention consists in the peculiar construction, arrangement and combination of parts all as hereinafter more fully described and shown in the accompanying drawings, in which:

Figure 1, is a perspective view of a sewing machine with my improvement attached; Fig. 2, a vertical central section through the casing showing the raising and lowering mechanism in elevation; Fig. 3, a vertical transverse section at right angles to Fig. 2, Fig. 4, a horizontal section of Fig. 2, looking down on the platform; Fig. 5, a plan view of the anti-friction rolls of the carriage showing the guide rod in section; Fig. 6, a section through the spring tensioning means, and Fig. 7, a modified construction of back.

The sewing machine proper is constructed in the usual nianner and comprises a wooden vcasing or housing 1 provided with the usual man 5, drive wheel 6, head 7, hand or drive wheelS, a table top 9 having the usual open- 16 are vertical guide rods preferably round and supported in an inclined position in brackets 17 secured to the back of the casing so that as the platform 18 is lowered the head 7 will clear the drive wheel.

19 are brackets secured to the under side of the platform and formed with a depending portion 20 provided with bifurcated arms 21 at its opposite ends extending ,at right angles thereto to embrace the guide rods 16 and 22 are anti-friction rollers journaled in said arms on opposite sides of the guide rods 16 to form a carriage for guiding said platform as it is raised or lowered.

In order to prevent any undue bindii'ig or wear of the parts the upper and lower arms 21 are placed some distance apart and the rolls 22 are preferably formed with inclined sides to give a four point contact on the guide rod, thus preventing any skewing.

23 is an arm secured upon the shaft 14 at one end and provided with a segmental end at its opposite end having parallel grooves in its face to receive cords or cables 24 which are adjustably secured at one end to the opposite ends of said segmental end by eye-bolts 25 passing through openings in the spider or divided end of the arm and provided with winged nuts 26 which may be turned to draw the bolts through the openings and thus slierten the cables.

27 is an apertured lug extending rearwardly from the rear edge of the platform 18, and 2S is a lifting rod provided with a re duced portion loosely fitting in said aperture and held therein by a nut 29 on its upper end. Apertures 30 are provided in the opposite ends of said rod 2S within which the opposite ends of the cables 24 are secured, the cable which is attached to the upper end of the segment being attached at its opposite end to the lower end of the lifting rod, and vice versa, so that as the segment is moved from the position shown in full, lines to that shown in dotted lines, the platform 1S will be raised, and when moved in a revei'se manner said platform will be lowered. The lifting rod is preferably loosely attached to the platform to permit it to swing laterally at its lower end and thus obviate the necessity vfor accurately securing said rod in parallelism with the guide rods 16 and locating the pivot for the arm 23 in accurate relation to said rods.

To counter-balance the weight of the platform and machine head thereon. so that but little power will be required to be applied to the hinged leaf to turn the shaft 14 and actuate the segment to raise or lower the platform, an involute cani 31 is secured upon said shaft 14 or hub of the arm 23, and a coiled spring 32 is secured at one end by a chain or cable 33 to said cam and its opposite end secured to the wall of the casing above by IOO IIO

' an opening in the said wall of the casing and provided with a squared end 36 for the application of a wrench to turn the plug and wind the cable thereon should it be desired to vary the tension of the spring at any time. The involute cam 31 is secured to the hub of the arm 23 in such a position relative thereto and to the segment that when the platform 18 is lowered, the spring will be put under a heavy tension, the cam extending downward and the cable to which the spring is secured, engaging the cam face throughout its length. I/Vhen the platform is raised by turning the arm, the cam turns also and as the spring shortens and exerts less force, its leverage is increased by its beingl attached to the free or projecting end of the cam which end swings laterally outward from the shaft as the arm is turned. The spring thus exerts a direct pull on the end of the arm when the platform is up and a constant and uniform force is applied by the spring to turn the shaft in all positions of the platform.

In order to prevent a too sudden operation of the parts should the leaf be let drop by ac cident or otherwise I provide a pneumatic or liquid dash pot comprising a cylinder 37 pivotally secured at one end by a bracket 3S to the casing and 39 is a piston having its rod 40 pivotally connected to the yoke arm 23. 41 is a by-pass in said cylinder controlled by a valve 42.

43 is a removable door in the back of the casing.

In Fig. 7, I have shown a modified construction of cast metal skeleton back 44 integrally formed with the brackets 17, 38 and bearings 15, 35 thus insuring alignment of the parts. The skeleton back being covered by a sheet metal plate 45.

Having thus fully described my invention, what I claim is 1. In a drop-head sewing machine, the combinationwith a casing, of a movable platform adapted to be raised and lowered in said casing and upon which the sewing machine head is supported, of a lifting rod attached at one end to the platform and extending downward therefrom, a segmental member pivotally supported adjacent to said lifting rod, a cable attached at one end to the upper end of said segmental member and at its opposite end to the lower end of the lifting rod, a second cable attached at one end to the lower end of the segmental member and at its opposite end to the, upper end of the rod, and means for turnin said segmental member.

2. In a drop-v ead sewing machine, the combination with a movable platform adapted to be raised and lowered and upon which the sewing machine head is supported, of a lifting rod loosely secured at one end to the platform to have a slight lateral movement at its opposite end, inclined guide rods for the platform, a segmental member pivotally supported adjacent to said lifting rod, cables adjustably attached at one end to the ends of the segmental member and at their opposite ends to the opposite ends of the lifting rod, l23nd means for turning said segmental mem- 3. In a drop-head sewing machine, the combination with a casing, of a movable platform within the casing upon which the machine head is supported, an arm pivoted to the casing at one end and connected to the platform at its opposite end to raise and lower the same, a member extending laterally from and secured to the pivot of the arm to turn therewith and arranged to extend downward from said pivot when the arm is in its lowered position,` means for turning said arm, and a spring attached at one end tothe free projecting end of said member and secured at its opposite end to a support on the casing above the pivot, whereby as the strength of the spring decreases, the leverage of the member increases.

4. In a drop-head sewing machine, the combination with a casing, of a movable platform within the casing upon which the machine head is supported, an arm pivoted to the casing at one end and connected to the platform at its opposite end to raise and lower the same, an involute cam secured to the pivot of the arm to turn therewith and arranged to extend downward from said pivot when the arm is in its lowered position, a spring secured at one end to a support on the casing above said pivot and attached at its opposite end to the projecting end of the cam by a cable which engages the face of the 'cam when the arm is lowered and means for turning the arm and cam.

5. In a drop-head sewing machine, the combination with a casing, a platform for a sewing., machine head, and guides in the casing for said platform, of a shaft extending through the wall of the casing, an arm secured to said shaftat one end and attached to the platformat its opposite end to raise and lower the same, means on the outer end of the shaft for turning the same, an involute cam secured to the shaft to turn with the arm and arranged to extend downwardly from said shaft when the arm is in its lowered position, a bushing in an opening in the wall of the casing above the shaft, a plug frictionally secured within the bushing and arranged to be turned therein, and a spring having a cable secured to each of its ends one of said cables being attached to the free projecting end of the cam to engage the cam face throughout the length of the face when the arm is in its lowered position and the other cable being attached to and wound upon said plug.

6. In a drop-head sewing machine, the

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vII() combination With a casing, a platform for a sewing machine head, and guide rods in the casing for said platform to guide the same when raised or lowered, of a lifting rod se cured to the platform, an arm piveted on the Wall of the casing at one end and provided with a segmental face at its opposite end having parallel grooves, cables attached at one end te the upper and lower ends of the lifting rod, eye-bolts secured to the opposite ends'of the cables and extending through openings in the arm and engaged by thumb platform.

7 In a drop-head sewing maclnne, the combination of a casing provided with a hack i l l i l l wall formed with inwardly extending hrackets7 rods secured to and held hy said hrackets at an inclination to the perpendicular and at a distance from the wall of the casing, a platform for supporting a sewing machine head, brackets secured to said platform having depending portions provided with rearwardly extending hifurcated arms to emhraee the rods, rolls journaled between said arms having grooved faces formed with inclined sides to engage the rods at each side7 and means for raising and lowering said, platform. nuts to adjustahly secure the cables within the grooves of the segmental face, and means for turning the arm to raise and lower the In testimony whereof l aflx my signature in presence of two witnesses.

FltANClS l). llUYCK.

lVitnesses: I

Davie llUYeK, BUD A. GEHRING. 

